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Material for high strength, controlled recoil stent

a recoil stent and high strength technology, applied in the field of alloys, can solve the problems of inadequate microstructural tailoring of intravascular stents, and achieve the effect of simple and inexpensive manufacturing

Inactive Publication Date: 2006-01-26
CORDIS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The biocompatible material for implantable medical devices of the present invention offers a number of advantages over currently utilized materials. The biocompatible material of the present invention is magnetic resonance imaging compatible, is less brittle than other metallic materials, has enhanced ductility and toughness, and has increased durability. The biocompatible material also maintains the desired or beneficial characteristics of currently available metallic materials, including strength and flexibility.
[0010] The biocompatible material of the present invention is simple and inexpensive to manufacture. The biocompatible material may be formed into any number of structures or devices. The biocompatible alloy may be thermomechanically processed, including cold-working and heat treating, to achieve varying degrees of strength and ductility. The biocompatible material of the present invention may be age hardened to precipitate one or more secondary phases.
[0011] The intraluminal stent of the present invention may be specifically configured to optimize the number of discrete equiaxed grains that comprise the wall dimension so as to provide the intended user with a high strength, controlled recoil device as a function of expanded inside diameter.

Problems solved by technology

Currently manufactured intravascular stents do not adequately provide sufficient tailoring of the microstructural properties of the material forming the stent to the desired mechanical behavior of the device under clinically relevant in-vivo loading conditions.

Method used

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  • Material for high strength, controlled recoil stent
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  • Material for high strength, controlled recoil stent

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Embodiment Construction

[0016] Biocompatible, solid-solution strengthened alloys such as iron-based alloys, cobalt-based alloys and titanium-based alloys as well as refractory metals and refractory-based alloys may be utilized in the manufacture of any number of implantable medical devices. The biocompatible alloy for implantable medical devices in accordance with the present invention offers a number of advantages over currently utilized medical grade alloys. The advantages include the ability to engineer the underlying microstructure in order to sufficiently perform as intended by the designer without the limitations of currently utilized materials and manufacturing methodologies.

[0017] For reference, a traditional stainless steel alloy such as 316L (i.e. UNS S31603) which is broadly utilized as an implantable, biocompatible device material may comprise chromium (Cr) in the range from about 16 to 18 wt. %, nickel (Ni) in the range from about 10 to 14 wt. %, molybdenum (Mo) in the range from about 2 to 3...

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Abstract

A biocompatible metallic material may be configured into any number of implantable medical devices including intraluminal stents. The intraluminal stents may be specifically configured to optimize the number of discrete equiaxed grains that comprise the wall dimension so as to provide the intended user with a high strength, controlled recoil device as a function of expanded inside diameter. One biocompatible metallic material may comprise a Cobalt-Chromium alloy having substantially reduced Iron and / or Silicon content.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to alloys for use in manufacturing or fabricating implantable medical devices, and more particularly, to intravascular stents manufactured or fabricated from alloys that provide high strength and controlled recoil. [0003] 2. Discussion of the Related Art [0004] Currently manufactured intravascular stents do not adequately provide sufficient tailoring of the microstructural properties of the material forming the stent to the desired mechanical behavior of the device under clinically relevant in-vivo loading conditions. Any intravascular device should preferably exhibit certain characteristics, including maintaining vessel patency through a chronic outward force that will help to remodel the vessel to its intended luminal diameter, preventing excessive radial recoil upon deployment, exhibiting sufficient fatigue resistance and exhibiting sufficient ductility so as to provide adequate cove...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F2/06
CPCA61F2/91A61F2/915A61F2230/0013A61L31/02A61F2002/91533
Inventor BURGERMEISTER, ROBERTCHEN, CHAO CHINGRISHABER, RANDY-DAVID BURCE
Owner CORDIS CORP
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